Anchor intervals
In our western tonal/modal music the pure octave, fourth and fifth play a key-role in the way we orientate and navigate in pitch-space.
The scales/pitch collections of western depart from the principle of octave equivalence; this indicates the phenomenion that we experience notes with the same name in a different octaves as a kind of replica of each other.
Scales/modes are rpesented in music theory as a pattern layout of the pure octave.
Anchor intervals are the intervals that should be so familiar that you can summon/produce them at any moment.
Use the next exercise; it contains a bourdon as reference for your orientation.
You can use a DAW (Logic, Cubase or the like) with an "organ" as VST-instrument, in order to get a sustained fifth.
Practice this with alll kinds of diffferent pure fifths.
NB The glissando approach is important; in this way to get a feeling of the distance you have to bridge and you can experience clearly when you merge with the target notes.
